wp user functions proposal: add-cap, remove-cap and list-caps

I need some individual capability manager for a project and I didn't find that option in the existing functions so I'm suggesting an extension with few functions:

    wp user add-cap <user> <cap>
    wp user remove-cap <user> <cap>
    wp user list-caps <user>
 
If you find that helpful, I'm willing to replicate that functionality for roles as well.